Buy it now !!!

in fact the processor would bring my render times from ~49h to 2h that would be worth considering

Your cooler will fit the processor in terms of compatibility. However, the official description of the cooler (https://www.bequiet.com/en/cpucooler/1525) says it's indicated for up to 32 cores. This probably means that it will not dissipate enough heat and will run a bit too hot on long compute-intensive jobs. It could also mean that the cooler manufacturer is being a bit cautious in their promises. If I were you, I'd still give it a go and see how it performs. If your cooler underperforms, I can recommend an AIO solution like the one I used: Corsair iCUE H150i Elite Capellix XT this will keep your processor under 75C at all times no matter what. Good luck

This is currently not known.

Yes, but only together with a GV100 (HP Quadro GV100 (32GB),) because these games need the 32GB VRAM.